Rotary power tool



May 8, 1945. c:.F. ovERLY ROTARY POWER TooL Filed May 20, 1942 2Sheets-Sheet 1 INVENTOR. K CHHRLE'S 'F'- OVERLY vMay 8, 1.945.- c.F.'ovER| Y ROTARY POWER TOOLv Filed May 20, 1942 2 Sheets-Sheet 2 FVG-12INVENTOR.` CHHRLES F'- 0VRLY Q wm,

.wmeniben` l l, l p I Fig. 5 Vis a, fragmentary side-view, partly in ymiPatented May 8, 1945 ROTARY POWER TOOL CharlesrEvOverly, East Cleveland,Ohio Application May zo, 1942, serialrNo.44s,743

fjTliis invention l"relates in general to rotary powerj tools r andimore' particularly to rotary power tools with pneumatic,governor-controlled motors, in whichj tools the' governor controls the",airsupply to them'otor.. Inthese tools the gov- 3:5 I ernors,l when'Iconstructed as so-called through- ."gove'rnors, effect disturbingturbulent air streams which decrease the efliciency of the power'tool,and, when constructed to cooperate with station- The general object ofthe present invention is the provision-of a simplied rotary power `toolof 'thetypejreferred tol above,fin which tool then A 'rotor of vthemotor mounts' the governor and its ul5 valve to decrease wearandtear-'On the governor and its valve by 'eliminating rotary movementsbetween `these elements. general object of the inventionv is attained yby arranging'the governor valve within the r'otorJZO 'for its-'shaftinvsuch a manner that the rotor o`r its'shaft forms the valve body forthe governor valve which rotates jointly with rotor ,and gov- Yernor. lQ

lAnotherobjeot of the present inventionthere- 25 yfore vis'theprovisiony of a rotary'toolfv embodying a: governor.- directlycoupledwith the rotorof its :motor and a governor valveaxiallyalignedwith aand arranged with respect to the rotor Or-its shaft,so that'the latter forms the valve body'so `for the'governor valve. V

In addition,- .the `invention has Aother marked superiorities whichradicallydistinguish` it from y These improve presently knownstructures. ments embodying certain novel-features of con-Astructionjarer more clearly` set forth in the followingspecilcation'and the appended claims,

Yand twol preferred'em'bodiments of the invention are `:hereinaftershown ywith reference to the 'acl'c'ompanyin'g drawings iormingpart ofthe specihandle member'of the tool shown in Fig. '1.

Fig. `3 isl a side-view of the governorand Fig 3a 50 is aiperspectiveview of the` governor. N Fig. 4 is av side-view ofthe rotor and shaftelevation, of the driveshaft.'` t.' l

and controlheadjand 1 Fig. `9 is a yfragmer'itaryside-view offthe Vfronthead` f .Y vary'valve elements, are ,subjected to excessive (Toweara'ndtear.

II-Afef Figi. f-

l `f'Fig.12 is a transverse sectional viel t Online Fig. 16 is afragmentary, longitudinal sectional fview-of Va rotary power toolembodying `a somefwhat modifiedgovernor and governor valvear- Fig. 6 isaside-view ofthe control and handle head. f f

therotor.' l j *Fig-8 is' a side-view ofthe assembled cylinder Fig. -10is a transverse sectional viewonline lo-Intime 1. 1 j fjf Fig. 11=``s-atransverse'sectional yviewuon line Fig. 15 is a transverse `sectionalview Online rangement mounted according totheinve'ntion'.

Figs. 17 and 18 are side-views ofthe governor Valve stem and governorvalve of the shown distributing lbushing, of such tool.v

j Referring now more particularly tofthe-e'xem- Va control head 4,alcylinder section Stand afront' ihead 6. "This power tool hasarrangedin itscylinder section 5a pneumatic motor 1 embodyirig acylinder 8 with inlet and outlet passages `9l and 9. Cylinder 8 which iseccentrically relatedito theaxisqof-the tool `carries in, its workingchamber Il) afrotor II arranged ,concentricallyf with respect toysaidaxis, which rotor is providedzwith afplurality of blades I2 slidablyarranged in vslots I41forloscil1ation in said slots during rotationofthe rotorall as customary in the art. Therotor ,II-i is. formed with twoshafts I Sand I6 integrally extended from its opposite end faces, whichshafts are 'axially aligned with eachother and support 'the rotor inball bearings ITand I8 mountedin control `head 4 `and `front head `6respectively.

The shaft I 5, which is extended into control'head 4, carries at'its enda governor I 9 embodyingfa base memberru having a tubular,' threaded:portion, threaded upon the lthreaded end `2 l""of,sl'1`aft I'5, Aandweighted governor arms 22' piv'ota'lly couv.

. p1ea with the base member zu .by pins, 2'3. This l v 30 in handlemember 3, which member Caresat l` governor actuates upon a piston-likegovernor i l valve 24 which is slidably `arranged in a bore 25 'inshaft` l5 to permit its upward shifting when i airunder pressure enterssaid bore and its down- I ward shifting when centrifugal force shiftslevers 2 26 of the governor arms toward the end of shaft I5. The boreinshaft vl5 forms a valve chamber y for governor valve 24 and isprovided with openings 2128v varranged below valve .24 .in .spacedrelation @vil-h1 respect to each otherlengthwise vof shaft 1 5. Governorvalve 24 is provided with f 66 and 6l forced toward each otherk .by an'ut member 68. l

Preferably, as shown, cone-shaped strainer 46 is closed at its lowerendby a readily removable set screw 69, so as to permit of propercleaning and blowing out of the strainer by air whensaid 'set screwlQhas been removed.

The thus constructed rotary power tool which can readily and easily `beassembled and disassembledlpermts of ready access to pneumatic lmeter '1andgts goveriiicir'll-S. fThus; by'unscrew- I ing'fbo'l'tsv 10:connecting handle member 3 with a head portion 23 and dimensioned topartlyuor'` fr Air is fed .to motor 1 tnreugn'an .en 'pessage ytherotary speed fully close opening 21 in shaft I5 to decrease 'o' vfullyshut oi air feed to the working chamber-.T3515 r.of motor-1, so as tofully control of rotor Il by governor I9.-

j its outer end a connecting bushing 3| for a hosef20 oonnectionnotshown; This `air passage is ton-` trolled by a spring-pressed shut-offvalve 3,21 the? amy arranged in etushing 31 and eniiteblyes. eceupledwith a trigger .38.. f trigger-ispivotal-l ly mounted in a slot 39.handlemember Shyl yrmeansofa 'n.piv-ot pin 40 and embodies a 'camshapedinner portion 4I `arranged opposite-the.: 42, adi-@330;

push 'pin 136 andtwo operatingarms mensioned and 'arranged so thateitherarrn,

when-ininopera-tive position, is :fully extended "into slot 39 and,whendn operative, positiorng is'lgfully extendedjoutsideyof said slotseef'liigsg i Ythroughl adistrihutng 4 8 rientrally` 15 1 and 2);V Theinner cam-shaped -yportion All; offlsl` trigger includes at the end-efit s l-ifting cam M alrecess 4,4 cooperating with'thepush pi-n controlhead 4, the handle membery may beremoved to `permit of ready removal ofgovernor '19f, and :governor valve 24;., and, by unscrewing bolts 1lyconnecting the cylinder section 5 Withw the front lhead 6, the frontheadmay be removed nto expose the fi-'ont end of rotor Il. Removal andreassembly of the handle member of the tool is faoilitated byarrangement of a cylindrical sealingmember 1.2 which preventsleakageofnair `passing through4 .passage .302without .the use of 'a :gasketbetweenthandlemember V3 and controlhead removal andreassembly ofthe'front fthev frontend *plate '1'3. to`frothead .6 by .a bfolt e- T4,,so that removal of said front .head freely "ex'pses '.rotior, "l 1 for..repair ,and eichangefmof -earl ,of the .tool .is facilitatedhyfattachm'ent -of .".Ihe modiedgoverno'r and .governor valve`arrangement shown in Figs, 16' through .19 embodies $1.6slidahly mountsv.a valve .stem 8 .l i

v rangedslots l83 ein the wall ofthe bored end ,1.9 of y' 40.

arranged With-in -afborel @phtml hemel-and snallygto! theinlet passagesSiV of cylinder.

g Thus,'busl'ing 48 has extended throughzitsfcentralfbere .the shaftlined is yprovided yWith two inner circular 5l and l52 alignedwith 5.50.Shownffig lmmugh 19 coselyresem] l f the openings 21 and 2-inAshaftffiS in cornmu-y @nicationxwlith the. passage 41, Yand apassage:53

by means fof bores 5 4 an d fwhich latter-passage The. airthus'ffed t@the @werking chamber the vmotor is; discharged from. said chamberthrough ioutlet passages l0 finto faf--deector chamber 56 'shaft V:Itwhich extends :inte the frontman #60 'j vva rotorv .15,. .the .shaft116.gifV v-whicli mounts a :govmf' valve'l slidably mounted on the bored`end 19 .coupled by. means .of a pin 82' with .sleeve valve l' 8. Thispin extends throiigir oppositely ^ar,

the sha-ftandpermits shifting of the sleeve valve throughlvalvestem- 8l.by 'governors 11, Shaftfli is encircled tbye distributing ,sleeve vMcommun-i- .catirrgwithgair passagesj and;86 throughbores l8T and 88.4This sleeve includes circular recesses 83 andas! nits .in-ner wall".effectingv communi;

HcationV between @passages 85 and B5 when Szsleeve 1- valve; 13 fiss-inits vopen' iposition rand, preventing' such-communication when .saidJsleevevalve itsclosede 'positien.; Qtherwise the `:strluclmre-,

structure previously described: -Y and' therefore further descriptionv:t-herf'aofis lsuperilous;

, Havingft'hus described fthe ,.inventionewhat ;I ".claimissr. i

. 1.4 '1.1.1 afrotary i-foei fpnennene meter., a 'musing ave..intereenneeten ;bers', a sa ft monntin-gsaidjrotor:having-erregend tsseeupienfwith a eme .shaft ysa .by :means era v y flfJAshaped keymem'beri V59 'lhis-drive' shaft Yis #rotatably 'mounted infront head 6byjmearisoi a ballffbearing 60 and has its 'inner rend*shaped to 'perfsswh-ifenje seatenintnesekey-.siets and heid' f 1in rproper `position by a"split 'ring' engages thef;

.iewer ene e grinding wne'ei .as thereto,

Vfefdoo've s'aidfinlle'it passage fandfoontrolledbysaid .f "fliore .esumfv, Pvmnerees Iwere Wheel washers; msv predetermined speedsense-lashed.;

etfeid its@ the other Qfsaidhembersend said @ndtpartiell provided.-Wbhnwial Thera@ solid valve axially s'hiftably extended intosaid-.hereda lateral air inlet passage for said .here iarranged;belowVsaid valve andnot controlled thereby, .a.llatg eral fair 4'outlet4passagfe for said bore; arranged valve1 AV-a valv sleeve encirclingvthe bored end of SagesJ wie @We Slel'efand Said ,valve @Operating withsaidsnartinseanng the 'saidf'one chamber,

and a governoronsaid end 'of sagidfshaft jwithlnv lsaid other'fchamlber#engaging said' valve d and 2. .In a rotary power tool with a pnuematicmotor, a housing having a rotor chamber and a.

governor chamber, a rotor in said rotor chamben.

valve and .not controlled thereby, a lateral air:

outlet passage for said bore `arranged above said outlet and controlledby said valve, a .bearing sleeve between said two chambers; encirclingthe mined speeds of said shaft.

in its inner wall communicating with said inlet and outlet passages,said bearing sleeve and said valve cooperating with said'shaft insealing said governorl chamber from said bore in said shaft and saidrotor chamber, anda governor on said end of said shaft engaging saidvalve andadapted Vto shift same against air pressure in said .bore

passage at predeterfor control of said outlet CHARLES F. OVERLY;

` bored end of said shaft and formed with recesses

